Composer 1.5 vs Grok 4 Heavy
Cursor Composer 1.5 | SpaceXAI Grok 4 Heavy | |
|---|---|---|
| Overview | ||
| Company | Cursor | SpaceXAI |
| Release date | Feb 8 2026 | Jul 9 2025 |
| Access | Proprietary | Proprietary |
| Benchmarks | ||
Next.js coding Next.js EvalsVercel's open eval of how well AI coding agents build and migrate real Next.js apps — measured as the share of tasks the agent completes successfully. Higher is better. | 67% | — |
| Timeline | ||
| Release gap | Grok 4 Heavy shipped 214 days before Composer 1.5 | |
Which is better: Composer 1.5 or Grok 4 Heavy?
Composer 1.5 and Grok 4 Heavy don't publish scores on any of the same benchmarks, so there's no direct head-to-head comparison. Grok 4 Heavy shipped 214 days before Composer 1.5, so benchmark comparisons should account for the intervening progress.
Published specifications for these two models are limited — see each model page for the latest details.
Direct benchmark comparisons are unavailable — Composer 1.5 and Grok 4 Heavy don't publish scores on any of the same benchmarks.
Frequently asked questions
Composer 1.5 was released by Cursor on Feb 8 2026.
Grok 4 Heavy was released by SpaceXAI on Jul 9 2025.
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